add map parse (#405)

* add map parse for annotations 
* Fixes: #371

Signed-off-by: Gabriele Santomaggio <G.santomaggio@gmail.com>

---------

Signed-off-by: Gabriele Santomaggio <G.santomaggio@gmail.com>

Author: Gsantomaggio

RabbitMQ.Stream.Client/AMQP/AmqpWireFormattingRead.cs

@@ -4,6 +4,7 @@
 
 using System;
 using System.Buffers;
+using System.Collections.Generic;
 using System.Runtime.CompilerServices;
 using System.Text;
 
@@ -18,6 +19,7 @@ private static void PeekType(ref SequenceReader<byte> reader, out byte value)
         {
             reader.TryPeek(out value);
         }
+
         internal static int ReadType(ref SequenceReader<byte> reader, out byte value)
         {
             var read = WireFormatting.ReadByte(ref reader, out value);
@@ -154,12 +156,13 @@ internal static int ReadAny(ref SequenceReader<byte> reader, out object value)
                 case FormatCode.List32:
                     {
                         offset = ReadListHeader(ref reader, out var fields);
+                        object list = null;
                         for (long i = 0; i < fields; i++)
                         {
-                            offset += ReadAny(ref reader, out _);
+                            offset += ReadAny(ref reader, out list);
                         }
 
-                        value = null;
+                        value = list;
                         return offset;
                     }
 
@@ -168,13 +171,22 @@ internal static int ReadAny(ref SequenceReader<byte> reader, out object value)
                     {
                         offset = ReadMapHeader(ref reader, out var count);
                         var values = count / 2;
+                        Dictionary<string, object> map = new();
                         for (uint i = 0; i < values; i++)
                         {
-                            offset += ReadAny(ref reader, out _);
-                            offset += ReadAny(ref reader, out _);
+                            offset += ReadAny(ref reader, out var v);
+                            if (v is string key)
+                            {
+                                offset += ReadAny(ref reader, out var v2);
+                                map[key] = v2;
+                            }
+                            else
+                            {
+                                offset += ReadAny(ref reader, out _);
+                            }
                         }
 
-                        value = null;
+                        value = map;
                         return offset;
                     }
             }

Tests/Amqp10Tests.cs

@@ -4,6 +4,7 @@
 
 using System;
 using System.Buffers;
+using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using RabbitMQ.Stream.Client;
@@ -444,6 +445,30 @@ public void ValidateUuidMessagesFromGo()
             Assert.Equal(uuid_value, uuid_message.Properties.CorrelationId);
         }
 
+        [Fact]
+        public void ValidateAnnotationMap()
+        {
+            // shovel_annotations is a message with a map annotation
+            // coming from the Go client and the following configuration:
+            // source queue: "form"
+            // destination exchange: "to"
+            // queue bound to the exchange
+            // shovel from the source queue to the destination exchange
+            // the annotations will be added to the message
+
+            var buffer = SystemUtils.GetFileContent("shovel_annotations");
+            var reader = new SequenceReader<byte>(new ReadOnlySequence<byte>(buffer));
+            var shovelAnnotation = Message.From(ref reader, (uint)reader.Length);
+            Assert.NotNull(shovelAnnotation);
+            Assert.NotNull(shovelAnnotation.Annotations["x-shovelled"]);
+            var xShovelled = shovelAnnotation.Annotations["x-shovelled"] as Dictionary<string, object>;
+            Assert.NotNull(xShovelled);
+            Assert.Equal("hello-key", xShovelled["dest-exchange-key"]);
+            Assert.Equal("from", xShovelled["src-queue"]);
+            Assert.Equal("to", xShovelled["dest-exchange"]);
+            Assert.Equal("dynamic", xShovelled["shovel-type"]);
+        }
+
         [Fact]
         public void ValidateNilMessagesFromGo()
         {